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An investigation of the effects of pitch-roll (de)-coupling on helicopter handling qualitiesAn investigation of the effects of pitch-roll coupling on helicopter handling qualities was performed by the US Army and DLR, using a NASA ground-based and a DLR inflight simulator. Over 90 different coupling configurations were evaluated using a roll-axis tracking task. The results show that although the current ADS-33C coupling criterion discriminates against those types of coupling typical of conventionally controlled helicopters, it not always suited for the prediction of handling qualities of helicopters with modern control systems. Based on the observation that high frequency inputs during tracking are used to alleviate coupling, a frequency domain pitch-roll coupling criterion that uses the average coupling ratio between the bandwidth and neutral stability frequency is formulated. This criterion provides a more comprehensive coverage with respect to the different types of coupling and shows excellent consistency.
Document ID
19960033148
Acquisition Source
Ames Research Center
Document Type
Other
Authors
Ockier, C. J.
(Deutsche Forschungsanstalt fuer Luft- und Raumfahrt Brunswick, Germany)
Pausder, H. J.
(Deutsche Forschungsanstalt fuer Luft- und Raumfahrt Brunswick, Germany)
Blanken, C. L.
(NASA Ames Research Center Moffett Field, CA United States)
Date Acquired
August 17, 2013
Publication Date
January 1, 1995
Publication Information
ISSN: 0939-2963
Subject Category
Aircraft Stability And Control
Report/Patent Number
DLR-FB-95-08
Accession Number
96N29978
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Keywords
CONTROL COUPLING
RATE COUPLING

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